154 lines
5.8 KiB
Python
154 lines
5.8 KiB
Python
"""
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会话档案存储
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============
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按「会话指纹」持久化每个客户会话的对话档案（客户消息 + 我方回复 + 上次画面快照），
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写入 conversations.json，机器人重启后上下文不丢失。
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有了档案之后，机器人的提取策略从「每次翻屏复制大段历史」变为：
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- 首次遇到某会话：翻屏提取一次可见历史，建档；
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- 之后每次：只提取最新一屏，与档案中的上次画面快照做增量比对，
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只把【新增的消息】发给 AI，完整上下文由档案历史直接提供。
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"""
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import json
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import os
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import time
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import threading
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# 每个会话最多留存的消息条数（防止档案无限膨胀；AI 实际使用条数由 AI_CONTEXT_MAX_ROUNDS 决定）
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MAX_MESSAGES_PER_SESSION = 200
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# 画面快照最多留存的行数（用于增量比对）
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MAX_SNAPSHOT_LINES = 80
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class ConversationStore:
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def __init__(self, path: str):
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self.path = path
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self._lock = threading.Lock()
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self._data = {}
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self._mtime = 0
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self._load()
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# ── 持久化 ────────────────────────────────────────────────────────────────
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def _load(self):
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try:
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if os.path.exists(self.path):
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with open(self.path, encoding="utf-8") as f:
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self._data = json.load(f)
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try:
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self._mtime = os.path.getmtime(self.path)
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except Exception:
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self._mtime = 0
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else:
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self._data = {}
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self._mtime = 0
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except Exception:
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self._data = {}
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self._mtime = 0
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def _maybe_reload(self):
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"""GUI 删除档案后，监听进程下次读写前自动同步磁盘。"""
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try:
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mt = os.path.getmtime(self.path) if os.path.exists(self.path) else 0
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except Exception:
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return
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if mt != self._mtime:
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self._load()
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def save(self):
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"""原子写入磁盘（先写临时文件再替换，避免中途崩溃损坏档案）。"""
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with self._lock:
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tmp = self.path + ".tmp"
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try:
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with open(tmp, "w", encoding="utf-8") as f:
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json.dump(self._data, f, ensure_ascii=False, indent=1)
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os.replace(tmp, self.path)
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try:
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self._mtime = os.path.getmtime(self.path)
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except Exception:
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pass
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except Exception:
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pass
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# ── 档案访问 ──────────────────────────────────────────────────────────────
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def _entry(self, fp_hex: str) -> dict:
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self._maybe_reload()
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return self._data.setdefault(fp_hex, {
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"history": [], # [{"role": "user"/"assistant", "content": str, "ts": float}]
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"last_lines": [], # 上次提取时聊天框的画面快照（按行），用于增量比对
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"updated": 0,
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})
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def has_record(self, fp_hex: str) -> bool:
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self._maybe_reload()
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e = self._data.get(fp_hex)
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return bool(e and (e.get("history") or e.get("last_lines")))
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def history(self, fp_hex: str) -> list:
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"""返回该会话的消息历史（列表为活引用，请勿直接修改，用 append）。"""
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return self._entry(fp_hex)["history"]
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def append(self, fp_hex: str, role: str, content: str):
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e = self._entry(fp_hex)
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e["history"].append({"role": role, "content": content, "ts": time.time()})
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if len(e["history"]) > MAX_MESSAGES_PER_SESSION:
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e["history"] = e["history"][-MAX_MESSAGES_PER_SESSION:]
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e["updated"] = time.time()
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def last_lines(self, fp_hex: str) -> list:
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return self._entry(fp_hex)["last_lines"]
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def set_last_lines(self, fp_hex: str, lines: list):
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e = self._entry(fp_hex)
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e["last_lines"] = list(lines)[-MAX_SNAPSHOT_LINES:]
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e["updated"] = time.time()
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def list_sessions(self, limit: int = 200) -> list:
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"""按最近更新排序，返回会话摘要列表。"""
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self._maybe_reload()
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items = []
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for sid, entry in (self._data or {}).items():
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if not isinstance(entry, dict):
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continue
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hist = entry.get("history") or []
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preview = ""
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for m in reversed(hist):
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c = (m.get("content") or "").strip()
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if c:
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preview = c.replace("\n", " ")[:80]
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break
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if not preview:
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lines = entry.get("last_lines") or []
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preview = " ".join(lines[-3:])[:80] if lines else ""
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items.append({
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"session_id": sid,
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"updated": entry.get("updated") or 0,
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"message_count": len(hist),
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"preview": preview,
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})
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items.sort(key=lambda x: x.get("updated") or 0, reverse=True)
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return items[: max(1, min(limit, 500))]
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def delete(self, fp_hex: str) -> bool:
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"""删除指定会话档案。"""
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self._maybe_reload()
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with self._lock:
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if fp_hex not in self._data:
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return False
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del self._data[fp_hex]
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self.save()
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return True
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def clear_all(self) -> int:
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"""清空全部会话档案，返回删除条数。"""
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self._maybe_reload()
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with self._lock:
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n = len(self._data)
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self._data = {}
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self.save()
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return n
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def count(self) -> int:
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self._maybe_reload()
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return len(self._data or {})
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